Tunable Giant Electromechanical Properties in Defective Co-doped Ceria Systems

Ahsanul Kabir, Vincenzo Esposito

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Abstract

Recent studies demonstrate that highly defective cerium oxide, e.g. Gd-doped ceria, is capable of generating a giant electromechanical effect that is orders of magnitude larger than other ceramic based electrostrictors, e.g. lead-based piezoelectrics. This is an unconventional response as it does not obey the Newnham’s empirical law and it is atomistically explained by the lability of Ce- pairs. In this report, we investigate the electrostrictive properties of defective ceria with 0.25−3.75% oxygen vacancies introduced by a co-doping (Sm, Nd) concept. The codoping strategy leads to a different oxygen vacancy configuration in the lattice than for the single dopant case, delineated by a relatively lower vacancy-dopant association energy. This results in electrostrictive response with high strain coefficient (M33 in the 0.1-10 10-17 m2/V2) as well as in marked, strain saturation effects to the applied field from 0 to 120 kV/m and in a relaxation behavior by increasing the frequency of the applied field (0.1 to 1 kHz). Remarkably, M33 follows a strict dependency on oxygen vacancy configuration rather than their nominal concentration. Such outcomes define the hypothesis that electrostriction does occur due to oxygen vacancy concentration but it is firmly tuned by oxygen vacancy
Original languageEnglish
Publication date2020
Number of pages2
Publication statusPublished - 2020
EventElectronic Materials and Applications 2020 : (EMA 2020) - Daytona, United States
Duration: 22 Jan 201924 Feb 2020

Conference

ConferenceElectronic Materials and Applications 2020
CountryUnited States
CityDaytona
Period22/01/201924/02/2020

Keywords

  • Giant electrostriction
  • Oxygen defects
  • Blocking barrier
  • Saturation

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